I've been trying to reproduce this with no luck. Have you guys ever had ACL's or extended attributes enabled when you mounted your ext4 filesystems? Can one of you with the broken patch-2.7 show the output of "tune2fs -l /dev/<yourrootdevice>"?

I can now confirm, that disabling CONFIG_SECURITY_SELINUX does the trick for me as well and i can use patch-2.7.0 then. Seems like if you enabled the flag (i do not know why i had that in the first place) but do not use it on the filesystem/system patch seems to dislike it.